Whites MXT User Manual download pdf (Page 21)

Gain Adjustment (continued)

5. In the Prospecting MODE the use of the SAT

(variable self-adjusting threshold) control will help

to maintain a smooth THRESHOLD "hum" par-

ticularly at higher GAIN settings and will be

covered in a later section.

6. While using a steady slow search coil sweep

speed, simultaneously advance GAIN towards

"+3". If the "OVERLOAD-REDUCE GAIN/

LIFT LOOP" alert keeps popping up on the

display, if a quiet smooth background THRESH-

OLD "hum" doesn't continue, or if ground noises

are a problem reduce GAIN.

7. The trash I.D. capability of the MXT also func-

tions more accurately when the GAIN is set at a

level which allows for smooth operation. Too

much GAIN can cause bad ground to distort the

proper identification of iron and non-iron targets.

8. Note: It is normal to hear changes, clicks or soft

beeps, coming from the audio (speaker) during

GAIN adjustments as the circuit shifts between

hardware and software gains (different electrical

parts of the circuitry). The GAIN control adjusts

both the hardware gain (hard physical component)

as well as the software gain (computer code)

alternating between the two throughout it's range.

As the MXT shifts between these two intricate

parts of the circuitry an audio indication notes the

transitions. This can be helpful. If you adjust the

Gain slightly, the audio notes a significant rather

than slight change.

9. The MXT provides more GAIN control range

than is typically useful assuring performance is not

left on the plate due to restricted assess/range.

Likely few areas will allow maximum GAIN (full

clockwise) without at least some degree of radical

(noisy) operation. Setting in the + area requires a

high degree of operator skill.

SAT SPEED CONTROL

(Prospecting Mode Only)

Chapter 5 MXT Controls

GAIN Control

Gain Adjustment (continued)

If, of course, "OVERLOAD-REDUCE GAIN/

LIFT LOOP" message is displayed common for

very nasty ground mineralization, you must heed it

and reduce the GAIN rather than raise it.

3. The object of increasing the GAIN is to get the

maximum available depth from the detector WITH-

OUT causing the "OVERLOAD-REDUCE

GAIN/LIFT LOOP" message to appear which

indicates an overload of the circuit.

4. In addition, any increase in GAIN adjustment

should NOT BE at the expense of maintaining a

smooth and constant THRESHOLD "hum". False

signals, beeps and static from bits of mineralization,

erratic behavior, and lapses in THRESHOLD all

can be the result of running with too much GAIN.

Chapter 5 MXT Controls

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Whites MXT User Manual Page 21

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